Internet Message Access Protocol (v4rev1) is described in RFC 3501.

IMAP4 Binary Content Extension is described in RFC 3516.

The IMAP UNSELECT command is described in RFC 3691.

The IMAP MULTIAPPEND Extension is described in RFC 3502.

The IMAP4 ID Extension is described in RFC 2971.

IMAP4 Namespace is described in RFC 2342.

IMAP4 Login Referrals are described in RFC 2221.

IMAP4 Mailbox Referrals are described in RFC 2193.

The IMAP4 QUOTA Extension is described in RFC 2087.

The IMAP4 ACL Extension is described in RFC 2086.

IMAP/POP AUTHorize Extension for Simple Challenge/Response is described in RFC 2195.